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MICROPROCESSOR INSTRUCTION REFERENCE->DAD

DAD rp   Add register pair rp to HL

HL <- HL + rp

Flags
    

S	Not affected
Z	Not affected
AC	Not affected
P	Not affected
C	Set if carry form bit 15, else cleared

No of bytes	Cycles
	8085	8080A
1	10	10

rp may be one of:

B  representing B,E
D  representing D,E
H  representing H,L
SP representing Stack pointer